Call me crazy but I'd give Chuck a good chance of icing Brock.
Chuck is great at counter punching and has if not the best takedown defense in the game. Randy was able stuff some of Brocks takedowns....Chuck is much better and with good footwork Brock will find it difficult to take him down.
Also, Randy was able to land right hands on Brock fairly easy, Chuck still has dynamite in his hands. Chuck is also at he's best when he faces a serious opponent. He took Randy,Jardine, and Evans lightly.....everyone expected him to steam roll over them.
So a focus Chuck can put up a good showing and possibly defeat Brock. He wouldnt have nothing to lose either...so what if he lost.